<![CDATA[Tilapia farming might increase the level of prevalence of streptococciasi. Immunostimulants can be used to enable non specific immune response. In addition defense mechanisms. Sargassum sp. including brown algae, has not ben known effectiveness as immunostimulan of tilapia (Oreochromis niloticus). The aim of this work was to obtain effective concentration of Sargassum sp extract in increasing the body defense of tilapia (Oreochromis niloticus) against streptococciasis. Research carried out experimentally by using a complete randomized design. There were five treatments and each treatment was repeated three times. The result concluded that application of Sargassum extract by injection was effective in inreasing the immunity of Nila fish against streptococciasis caused by the bacteria of Streptococcus innane. Observing on leucocyte difference parameters, phagocytic index and antibody titer the best application of Sargassum extract was at a dosage of 75 ug/g, leading to the highest survival level of 82.22 percents.]]>
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